Stuart, I've opened up the link and seen Llwydfaen Farm which forms part of the Bodnant Estate and the farm is near Tre Morfa and very near the River Conwy.
However the abode of Richard Evans according to my notes is LLWYDFANISSAF ( it should be two words Llwydfan Isaf) and is not the same name as the place you have looked at.
I don't know exactly where it is but when you have a name with Isaf (lower) there is usually another farm nearby called Llwydfan Uchaf (upper) but it is Llwydfan Isaf you are looking for.
If I can find the address then I'll post it for you. Have a look at this by putting the highlighted bit into Google
12-03-1828 The Salopian Journal- Last chance to read
At the Castle Inn, in the Town of Conway, in the County of Carnarvon, ... growing on Tremorfa, Llwydfan- issa, and Llwydfan- ucha, in the said Parish ...... to Miss Richards, only daughter of Mr. John Richards, of Llaufafr- isaf, iu the same county